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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package note
import (
"crypto/rand"
"errors"
"strings"
"testing"
"testing/iotest"
"golang.org/x/crypto/ed25519"
)
func TestNewVerifier(t *testing.T) {
vkey := "PeterNeumann+c74f20a3+ARpc2QcUPDhMQegwxbzhKqiBfsVkmqq/LDE4izWy10TW"
_, err := NewVerifier(vkey)
if err != nil {
t.Fatal(err)
}
// Check various manglings are not accepted.
badKey := func(k string) {
_, err := NewVerifier(k)
if err == nil {
t.Errorf("NewVerifier(%q) succeeded, should have failed", k)
}
}
b := []byte(vkey)
for i := 0; i <= len(b); i++ {
for j := i + 1; j <= len(b); j++ {
if i != 0 || j != len(b) {
badKey(string(b[i:j]))
}
}
}
for i := 0; i < len(b); i++ {
b[i]++
badKey(string(b))
b[i]--
}
badKey("PeterNeumann+cc469956+ARpc2QcUPDhMQegwxbzhKqiBfsVkmqq/LDE4izWy10TWBADKEY==") // wrong length key, with adjusted key hash
badKey("PeterNeumann+173116ae+ZRpc2QcUPDhMQegwxbzhKqiBfsVkmqq/LDE4izWy10TW") // unknown algorithm, with adjusted key hash
}
func TestNewSigner(t *testing.T) {
skey := "PRIVATE+KEY+PeterNeumann+c74f20a3+AYEKFALVFGyNhPJEMzD1QIDr+Y7hfZx09iUvxdXHKDFz"
_, err := NewSigner(skey)
if err != nil {
t.Fatal(err)
}
// Check various manglings are not accepted.
b := []byte(skey)
for i := 0; i <= len(b); i++ {
for j := i + 1; j <= len(b); j++ {
if i == 0 && j == len(b) {
continue
}
_, err := NewSigner(string(b[i:j]))
if err == nil {
t.Errorf("NewSigner(%q) succeeded, should have failed", b[i:j])
}
}
}
for i := 0; i < len(b); i++ {
b[i]++
_, err := NewSigner(string(b))
if err == nil {
t.Errorf("NewSigner(%q) succeeded, should have failed", b)
}
b[i]--
}
}
func testSignerAndVerifier(t *testing.T, Name string, signer Signer, verifier Verifier) {
if name := signer.Name(); name != Name {
t.Errorf("signer.Name() = %q, want %q", name, Name)
}
if name := verifier.Name(); name != Name {
t.Errorf("verifier.Name() = %q, want %q", name, Name)
}
shash := signer.KeyHash()
vhash := verifier.KeyHash()
if shash != vhash {
t.Errorf("signer.KeyHash() = %#08x != verifier.KeyHash() = %#08x", shash, vhash)
}
msg := []byte("hi")
sig, err := signer.Sign(msg)
if err != nil {
t.Fatalf("signer.Sign: %v", err)
}
if !verifier.Verify(msg, sig) {
t.Fatalf("verifier.Verify failed on signature returned by signer.Sign")
}
sig[0]++
if verifier.Verify(msg, sig) {
t.Fatalf("verifier.Verify succceeded on corrupt signature")
}
sig[0]--
msg[0]++
if verifier.Verify(msg, sig) {
t.Fatalf("verifier.Verify succceeded on corrupt message")
}
}
func TestGenerateKey(t *testing.T) {
// Generate key pair, make sure it is all self-consistent.
const Name = "EnochRoot"
skey, vkey, err := GenerateKey(rand.Reader, Name)
if err != nil {
t.Fatalf("GenerateKey: %v", err)
}
signer, err := NewSigner(skey)
if err != nil {
t.Fatalf("NewSigner: %v", err)
}
verifier, err := NewVerifier(vkey)
if err != nil {
t.Fatalf("NewVerifier: %v", err)
}
testSignerAndVerifier(t, Name, signer, verifier)
// Check that GenerateKey returns error from rand reader.
_, _, err = GenerateKey(iotest.TimeoutReader(iotest.OneByteReader(rand.Reader)), Name)
if err == nil {
t.Fatalf("GenerateKey succeeded with error-returning rand reader")
}
}
func TestFromEd25519(t *testing.T) {
const Name = "EnochRoot"
pub, priv, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
t.Fatalf("GenerateKey: %v", err)
}
signer, err := newSignerFromEd25519Seed(Name, priv.Seed())
if err != nil {
t.Fatalf("newSignerFromEd25519Seed: %v", err)
}
vkey, err := NewEd25519VerifierKey(Name, pub)
if err != nil {
t.Fatalf("NewEd25519VerifierKey: %v", err)
}
verifier, err := NewVerifier(vkey)
if err != nil {
t.Fatalf("NewVerifier: %v", err)
}
testSignerAndVerifier(t, Name, signer, verifier)
// Check that wrong key sizes return errors.
_, err = NewEd25519VerifierKey(Name, pub[:len(pub)-1])
if err == nil {
t.Errorf("NewEd25519VerifierKey succeeded with a seed of the wrong size")
}
}
// newSignerFromEd25519Seed constructs a new signer from a verifier name and a
// golang.org/x/crypto/ed25519 private key seed.
func newSignerFromEd25519Seed(name string, seed []byte) (Signer, error) {
if len(seed) != ed25519.SeedSize {
return nil, errors.New("invalid seed size")
}
priv := ed25519.NewKeyFromSeed(seed)
pub := priv[32:]
pubkey := append([]byte{algEd25519}, pub...)
hash := keyHash(name, pubkey)
s := &signer{
name: name,
hash: uint32(hash),
sign: func(msg []byte) ([]byte, error) {
return ed25519.Sign(priv, msg), nil
},
}
return s, nil
}
func TestSign(t *testing.T) {
skey := "PRIVATE+KEY+PeterNeumann+c74f20a3+AYEKFALVFGyNhPJEMzD1QIDr+Y7hfZx09iUvxdXHKDFz"
text := "If you think cryptography is the answer to your problem,\n" +
"then you don't know what your problem is.\n"
signer, err := NewSigner(skey)
if err != nil {
t.Fatal(err)
}
msg, err := Sign(&Note{Text: text}, signer)
if err != nil {
t.Fatal(err)
}
want := `If you think cryptography is the answer to your problem,
then you don't know what your problem is.
— PeterNeumann x08go/ZJkuBS9UG/SffcvIAQxVBtiFupLLr8pAcElZInNIuGUgYN1FFYC2pZSNXgKvqfqdngotpRZb6KE6RyyBwJnAM=
`
if string(msg) != want {
t.Errorf("Sign: wrong output\nhave:\n%s\nwant:\n%s", msg, want)
}
// Check that existing signature is replaced by new one.
msg, err = Sign(&Note{Text: text, Sigs: []Signature{{Name: "PeterNeumann", Hash: 0xc74f20a3, Base64: "BADSIGN="}}}, signer)
if err != nil {
t.Fatal(err)
}
if string(msg) != want {
t.Errorf("Sign replacing signature: wrong output\nhave:\n%s\nwant:\n%s", msg, want)
}
// Check various bad inputs.
_, err = Sign(&Note{Text: "abc"}, signer)
if err == nil || err.Error() != "malformed note" {
t.Fatalf("Sign with short text: %v, want malformed note error", err)
}
_, err = Sign(&Note{Text: text, Sigs: []Signature{{Name: "a+b", Base64: "ABCD"}}})
if err == nil || err.Error() != "malformed note" {
t.Fatalf("Sign with bad name: %v, want malformed note error", err)
}
_, err = Sign(&Note{Text: text, Sigs: []Signature{{Name: "PeterNeumann", Hash: 0xc74f20a3, Base64: "BADHASH="}}})
if err == nil || err.Error() != "malformed note" {
t.Fatalf("Sign with bad pre-filled signature: %v, want malformed note error", err)
}
_, err = Sign(&Note{Text: text}, &badSigner{signer})
if err == nil || err.Error() != "invalid signer" {
t.Fatalf("Sign with bad signer: %v, want invalid signer error", err)
}
_, err = Sign(&Note{Text: text}, &errSigner{signer})
if err != errSurprise {
t.Fatalf("Sign with failing signer: %v, want errSurprise", err)
}
}
func TestVerifierList(t *testing.T) {
peterKey := "PeterNeumann+c74f20a3+ARpc2QcUPDhMQegwxbzhKqiBfsVkmqq/LDE4izWy10TW"
peterVerifier, err := NewVerifier(peterKey)
if err != nil {
t.Fatal(err)
}
enochKey := "EnochRoot+af0cfe78+ATtqJ7zOtqQtYqOo0CpvDXNlMhV3HeJDpjrASKGLWdop"
enochVerifier, err := NewVerifier(enochKey)
if err != nil {
t.Fatal(err)
}
list := VerifierList(peterVerifier, enochVerifier, enochVerifier)
v, err := list.Verifier("PeterNeumann", 0xc74f20a3)
if v != peterVerifier || err != nil {
t.Fatalf("list.Verifier(peter) = %v, %v, want %v, nil", v, err, peterVerifier)
}
v, err = list.Verifier("PeterNeumann", 0xc74f20a4)
if v != nil || err == nil || err.Error() != "unknown key PeterNeumann+c74f20a4" {
t.Fatalf("list.Verifier(peter bad hash) = %v, %v, want nil, unknown key error", v, err)
}
v, err = list.Verifier("PeterNeuman", 0xc74f20a3)
if v != nil || err == nil || err.Error() != "unknown key PeterNeuman+c74f20a3" {
t.Fatalf("list.Verifier(peter bad name) = %v, %v, want nil, unknown key error", v, err)
}
v, err = list.Verifier("EnochRoot", 0xaf0cfe78)
if v != nil || err == nil || err.Error() != "ambiguous key EnochRoot+af0cfe78" {
t.Fatalf("list.Verifier(enoch) = %v, %v, want nil, ambiguous key error", v, err)
}
}
type badSigner struct {
Signer
}
func (b *badSigner) Name() string {
return "bad name"
}
var errSurprise = errors.New("surprise!")
type errSigner struct {
Signer
}
func (e *errSigner) Sign([]byte) ([]byte, error) {
return nil, errSurprise
}
func TestOpen(t *testing.T) {
peterKey := "PeterNeumann+c74f20a3+ARpc2QcUPDhMQegwxbzhKqiBfsVkmqq/LDE4izWy10TW"
peterVerifier, err := NewVerifier(peterKey)
if err != nil {
t.Fatal(err)
}
enochKey := "EnochRoot+af0cfe78+ATtqJ7zOtqQtYqOo0CpvDXNlMhV3HeJDpjrASKGLWdop"
enochVerifier, err := NewVerifier(enochKey)
if err != nil {
t.Fatal(err)
}
text := `If you think cryptography is the answer to your problem,
then you don't know what your problem is.
`
peterSig := "— PeterNeumann x08go/ZJkuBS9UG/SffcvIAQxVBtiFupLLr8pAcElZInNIuGUgYN1FFYC2pZSNXgKvqfqdngotpRZb6KE6RyyBwJnAM=\n"
enochSig := "— EnochRoot rwz+eBzmZa0SO3NbfRGzPCpDckykFXSdeX+MNtCOXm2/5n2tiOHp+vAF1aGrQ5ovTG01oOTGwnWLox33WWd1RvMc+QQ=\n"
peter := Signature{"PeterNeumann", 0xc74f20a3, "x08go/ZJkuBS9UG/SffcvIAQxVBtiFupLLr8pAcElZInNIuGUgYN1FFYC2pZSNXgKvqfqdngotpRZb6KE6RyyBwJnAM="}
enoch := Signature{"EnochRoot", 0xaf0cfe78, "rwz+eBzmZa0SO3NbfRGzPCpDckykFXSdeX+MNtCOXm2/5n2tiOHp+vAF1aGrQ5ovTG01oOTGwnWLox33WWd1RvMc+QQ="}
// Check one signature verified, one not.
n, err := Open([]byte(text+"\n"+peterSig+enochSig), VerifierList(peterVerifier))
if err != nil {
t.Fatal(err)
}
if n.Text != text {
t.Errorf("n.Text = %q, want %q", n.Text, text)
}
if len(n.Sigs) != 1 || n.Sigs[0] != peter {
t.Errorf("n.Sigs:\nhave %v\nwant %v", n.Sigs, []Signature{peter})
}
if len(n.UnverifiedSigs) != 1 || n.UnverifiedSigs[0] != enoch {
t.Errorf("n.UnverifiedSigs:\nhave %v\nwant %v", n.Sigs, []Signature{peter})
}
// Check both verified.
n, err = Open([]byte(text+"\n"+peterSig+enochSig), VerifierList(peterVerifier, enochVerifier))
if err != nil {
t.Fatal(err)
}
if len(n.Sigs) != 2 || n.Sigs[0] != peter || n.Sigs[1] != enoch {
t.Errorf("n.Sigs:\nhave %v\nwant %v", n.Sigs, []Signature{peter, enoch})
}
if len(n.UnverifiedSigs) != 0 {
t.Errorf("n.UnverifiedSigs:\nhave %v\nwant %v", n.Sigs, []Signature{})
}
// Check both unverified.
n, err = Open([]byte(text+"\n"+peterSig+enochSig), VerifierList())
if n != nil || err == nil {
t.Fatalf("Open unverified = %v, %v, want nil, error", n, err)
}
e, ok := err.(*UnverifiedNoteError)
if !ok {
t.Fatalf("Open unverified: err is %T, want *UnverifiedNoteError", err)
}
if err.Error() != "note has no verifiable signatures" {
t.Fatalf("Open unverified: err.Error() = %q, want %q", err.Error(), "note has no verifiable signatures")
}
n = e.Note
if n == nil {
t.Fatalf("Open unverified: missing note in UnverifiedNoteError")
}
if len(n.Sigs) != 0 {
t.Errorf("n.Sigs:\nhave %v\nwant %v", n.Sigs, []Signature{})
}
if len(n.UnverifiedSigs) != 2 || n.UnverifiedSigs[0] != peter || n.UnverifiedSigs[1] != enoch {
t.Errorf("n.UnverifiedSigs:\nhave %v\nwant %v", n.Sigs, []Signature{peter, enoch})
}
// Check duplicated verifier.
_, err = Open([]byte(text+"\n"+enochSig), VerifierList(enochVerifier, peterVerifier, enochVerifier))
if err == nil || err.Error() != "ambiguous key EnochRoot+af0cfe78" {
t.Fatalf("Open with duplicated verifier: err=%v, want ambiguous key", err)
}
// Check unused duplicated verifier.
_, err = Open([]byte(text+"\n"+peterSig), VerifierList(enochVerifier, peterVerifier, enochVerifier))
if err != nil {
t.Fatal(err)
}
// Check too many signatures.
n, err = Open([]byte(text+"\n"+strings.Repeat(peterSig, 101)), VerifierList(peterVerifier))
if n != nil || err == nil || err.Error() != "malformed note" {
t.Fatalf("Open too many verified signatures = %v, %v, want nil, malformed note error", n, err)
}
n, err = Open([]byte(text+"\n"+strings.Repeat(peterSig, 101)), VerifierList())
if n != nil || err == nil || err.Error() != "malformed note" {
t.Fatalf("Open too many verified signatures = %v, %v, want nil, malformed note error", n, err)
}
// Invalid signature.
n, err = Open([]byte(text+"\n"+peterSig[:60]+"ABCD"+peterSig[60:]), VerifierList(peterVerifier))
if n != nil || err == nil || err.Error() != "invalid signature for key PeterNeumann+c74f20a3" {
t.Fatalf("Open too many verified signatures = %v, %v, want nil, invalid signature error", n, err)
}
// Duplicated verified and unverified signatures.
enochABCD := Signature{"EnochRoot", 0xaf0cfe78, "rwz+eBzmZa0SO3NbfRGzPCpDckykFXSdeX+MNtCOXm2/5n" + "ABCD" + "2tiOHp+vAF1aGrQ5ovTG01oOTGwnWLox33WWd1RvMc+QQ="}
n, err = Open([]byte(text+"\n"+peterSig+peterSig+enochSig+enochSig+enochSig[:60]+"ABCD"+enochSig[60:]), VerifierList(peterVerifier))
if err != nil {
t.Fatal(err)
}
if len(n.Sigs) != 1 || n.Sigs[0] != peter {
t.Errorf("n.Sigs:\nhave %v\nwant %v", n.Sigs, []Signature{peter})
}
if len(n.UnverifiedSigs) != 2 || n.UnverifiedSigs[0] != enoch || n.UnverifiedSigs[1] != enochABCD {
t.Errorf("n.UnverifiedSigs:\nhave %v\nwant %v", n.UnverifiedSigs, []Signature{enoch, enochABCD})
}
// Invalid encoded message syntax.
badMsgs := []string{
text,
text + "\n",
text + "\n" + peterSig[:len(peterSig)-1],
"\x01" + text + "\n" + peterSig,
"\xff" + text + "\n" + peterSig,
text + "\n" + "— Bad Name x08go/ZJkuBS9UG/SffcvIAQxVBtiFupLLr8pAcElZInNIuGUgYN1FFYC2pZSNXgKvqfqdngotpRZb6KE6RyyBwJnAM=",
text + "\n" + peterSig + "Unexpected line.\n",
}
for _, msg := range badMsgs {
n, err := Open([]byte(msg), VerifierList(peterVerifier))
if n != nil || err == nil || err.Error() != "malformed note" {
t.Fatalf("Open bad msg = %v, %v, want nil, malformed note error\nmsg:\n%s", n, err, msg)
}
}
}
func BenchmarkOpen(b *testing.B) {
vkey := "PeterNeumann+c74f20a3+ARpc2QcUPDhMQegwxbzhKqiBfsVkmqq/LDE4izWy10TW"
msg := []byte("If you think cryptography is the answer to your problem,\n" +
"then you don't know what your problem is.\n" +
"\n" +
"— PeterNeumann x08go/ZJkuBS9UG/SffcvIAQxVBtiFupLLr8pAcElZInNIuGUgYN1FFYC2pZSNXgKvqfqdngotpRZb6KE6RyyBwJnAM=\n")
verifier, err := NewVerifier(vkey)
if err != nil {
b.Fatal(err)
}
verifiers := VerifierList(verifier)
verifiers0 := VerifierList()
// Try with 0 signatures and 1 signature so we can tell how much each signature adds.
b.Run("Sig0", func(b *testing.B) {
for i := 0; i < b.N; i++ {
_, err := Open(msg, verifiers0)
e, ok := err.(*UnverifiedNoteError)
if !ok {
b.Fatal("expected UnverifiedNoteError")
}
n := e.Note
if len(n.Sigs) != 0 || len(n.UnverifiedSigs) != 1 {
b.Fatal("wrong signature count")
}
}
})
b.Run("Sig1", func(b *testing.B) {
for i := 0; i < b.N; i++ {
n, err := Open(msg, verifiers)
if err != nil {
b.Fatal(err)
}
if len(n.Sigs) != 1 || len(n.UnverifiedSigs) != 0 {
b.Fatal("wrong signature count")
}
}
})
}